Simple Description

Red giants are formed when a smaller main sequence star runs out of fuel, cools and expands.

Further Detail

Smaller stars like our sun will form red giants in the future. A red giant then turns into a white dwarf and finally a black dwarf. Stars with more mass follw a different pathway - they will turn into a red supergiant.

Related Words:

• White dwarf
• Red supergiant
• Life cycle of a star

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